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Full text of "Text Book Of Mechanical Engineering"

944

Appendix III.

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Gas-Engine Trials.  We shall commence with the

BALANCE SHEET FOR GAS ENGINE.
(Datum lines: 32 F. and atmospheric pressure)

Heat supplied
in B.T.U. per m.

To:

(i) Heat of com-
bustion, due to
wt. of gas and air
passing   per m. j
-f heat  already \
in gas and air... j

Heat used      /" usefully
B.T.U. p. m.   \ and wastefully

By wasteful process:

(2)  Heat rejected in jacket

water.....................

(3)  Heat discharged in ex-

haust gases.............

(4)  Radiation   and    unac-

counted..................

Per

cent.

By useful process:
(5) Heat    converted    into
work in cylinder......

(i). Heat of combustion is evidently

Cub. ft. of gas
per m.

calorific value of i cub. ft.
of the gas.

The former is found by gas-meter, and the latter (about
650 B.T.U.) by analysis, or by means of a gas calorimeter.
Add to this the heat already in the gas awl air, abpve 32, thus

B.T.U.pern,

Cv of mixture, x (,-3,)

The value of the Cv and weight of mixture is given in para-
graph (3) following, and Cv is used instead of Cp because we are
really comparing the heat given with that in an imaginary gas
engine which receives at 32 and discharges at exhaust tempera-